body, html {
    height:100%;
    width:100%;
}
.header{
    background-color: darkgray;
    height: 35px;
}
.loginUl{
    width:auto;
    height:30px;
    margin:0 auto;
    float: right;
}
.login{
    height:30px;
    width:400px;
    float:right;
}
.login li{
    line-height: 20px;
    display: inline-block;
    margin-right:10px;
}
.menu li {
    width:100%;
    height: 50px;
    text-align: center;
    display: inline-block;
    margin-right:10px;position: relative;
}

.main{
    margin: 0 auto;
    text-align: center;
    background-color: chartreuse;
    width: 90%;
    width: 1200px;
    position: relative;
    top: 0px;
    left: 0px;
    height: auto;
}
.daohang{
    margin: 0 auto;
    text-align: center;
    width:1200px;
    border-top:10px;
}
.menu{
    width: 240px;
    height: 300px;
    float: left;
    background-color: greenyellow;
}
.pic{
    width: 940px;
    height: 300px;
    text-align: center;
    border-right: 12px;
    float: right;
}
.footer{
    clear:both;
    margin-bottom:-1px;
    width: 100%;
    text-align:center;
    position :fixed;
    bottom :0px;
}
.btn{
    width: 230px;
}
.tuisong
{
    clear: both;
    width: 850px;
    height: 300px;
    background-color: greenyellow;
}